Keystones — Lintel
Five GCSE retrieval questions · 12 December 2014 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.021 in standard form
Answer: 2.1 × 10-2 -
2. Algebra Factorising monic quadratics
Factorise: x² + 5x - 84
Answer: (x + 12)(x - 7) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 23cm, angle = 33°. Find opposite. Give your answer to 2 decimal places
Answer: 14.94cm -
4. Ratio Mixed ratio problems
In ratio 11:9:1, what fraction is the second part?
Answer: 3⁄7 -
5. Statistics Mean
The mean of 4 numbers is 36. If 3 of them are 16, 47, 48, what is the missing number?
Answer: 33